((() => {

  const x = 0;
  const z = 0;
  // comment
})());

(() => {
  let a= 1;
  // comment
  const y = 0;

})();

(() => {
  let x = 0;
  // comment
  let y = 0;
  let z = x + y;
  let foo = {};
  return bar;
})();

(function(){
  let x = 0;
  let y = 0;
  let z = x + y;
  let foo = {};
  return bar;
}());

(
  function
    ()
  {
  }
)
()